Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.

Extended rating:Rating Curve Extension - The Rating Curve Extension is calculated by using either a linear, logarithmic, or hydraulic technique to extend the rating curve above the currently established relationship between stage and flow.

Flood Impacts

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45

Major flooding with water to the roofs of lowest homes in the Frisch Auf Subdivision. Numerous mobile homes flood severely. Livestock in the flood plain above Smithville to below Columbus are vulnerable to drowning. Roads and bridges in the flood plain are severely flooded and dangerous. River is to the level of 2nd bank and threatens homes and businesses in La Grange.

43

Disastrous flooding of the Colorado River damages several mobile homes in La Grange and five permanent homes in the Fritsch Auf subdivision are flooded up to six to seven feet. Severely flooded roads and bridges near the river make travel and evacuations dangerous.

40

The lowest sites of a trailer park in La Grange in the northwest quadrant of Highway 71 and the Colorado river are threatened. Lowest homes in the Fritsch Auf subdivision have several feet of water in them. Severely flooded roads and bridges near the river make travel and evacuations dangerous.

37

Major flooding of the Colorado River reaches lowest homes in the Fritsch Auf Subdivision on the south bank of the Colorado River in La Grange. Severely flooded roads and bridges near the river make travel and evacuations very dangerous.

36

The lowest part of the road into the Fritsch Auf Subdivision just south of the Colorado River south of downtown floods. The Colorado River approaches lowest homes in the Fritsch Auf Subdivision and additional flow down Buckners Creek will flood them.

32

Moderate lowland flooding reaches the flood plain near La Grange. Homes in the Fritsch Auf Subdivision on the south bank of the Colorado River may be threatened if heavy runoff down Buckners Creek adds to the Colorado River flow at this level.

29

Flow covers lowest areas of the flood plain with no major damage. Lowest roads and bridges are flooded.

26

Minor lowland flooding covers low areas of the flood plain with no significant damage. Lowest roads and bridges are flooded.

23

Flow exceeds the low banks into lowest areas of the flood plain with no damage. Lowest roads and bridges are flooded.

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.